The most common cause of pain on the outside or lateral side of the foot is a condition usually called cuboid syndrome. The cuboid is a bone that is about half way down the outside of the foot and acts as a pulley for the tendon of a large muscle on the outside of the leg. As this tendon passes under the bone, the bone is going to have to be very stable to act as the pulley. If the bone is not stable and moves when this pulley passes around it, then the ligaments of the joints around the bone are going to get strained, resulting in the condition of cuboid syndrome. The treatment for this condition usually involves some rest and strapping to help prevent the joint moving as much. Often a manipulation can be helpful to mobilize the joint and reduce any subluxation. Sometimes foot orthotics are useful.
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